Table 4 This table shows an example of input for step 3, used to retrieve the location of unreadable patent documents.

From: Unveiling the geography of historical patents in the United States from 1836 to 1975

Inventor PN County State Year Class Frequency Class Coinc. Year Coinc.
A. G. Bell US1410875 DC DC 1922 114 7 1 1
A. G. Bell US1410875 Essex MA 1922 114 2 0 0
A. G. Bell US1410875 Middelsex MA 1922 114 1 0 0
A. G. Bell US1410875 Suffolk MA 1922 114 3 0 0
A. G. Bell US1410877 DC DC 1922 114 7 1 1
A. G. Bell US1410877 Essex MA 1922 114 2 0 0
A. G. Bell US1410877 Middelsex MA 1922 114 1 0 0
A. G. Bell US1410877 Suffolk MA 1922 114 3 0 0
A. G. Bell US181553 DC DC 1876 310 7 0 0
A. G. Bell US181553 Essex MA 1876 310 2 0 4
A. G. Bell US181553 Middelsex MA 1876 310 1 0 0
A. G. Bell US181553 Suffolk MA 1876 310 3 0 0
A. G. Bell US213090 DC DC 1879 381 7 3 1
A. G. Bell US213090 DC DC 1879 379 7 5 1
A. G. Bell US213090 Essex MA 1879 379 2 1 0
A. G. Bell US213090 Essex MA 1879 381 2 0 0
A. G. Bell US213090 Middelsex MA 1879 381 1 0 0
A. G. Bell US213090 Middelsex MA 1879 379 1 0 0
A. G. Bell US213090 Suffolk MA 1879 379 3 2 0
A. G. Bell US213090 Suffolk MA 1879 381 3 4 0